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MCB Stage-1 Top End Rebuild Kit Piston kit Yamaha YZ 250 1999-2024 with Cylinder

Wossner /Pro-x Top End Piston Rebuild Kit

SKU: 23431194

MCB Stage-1 Top-End Rebuild Kit with cylinder for 1999-2024 Yamaha YZ250 . This engine rebuild kit includes a Wossner Premium Forged Piston /Pin 8216DA, Genuine Riken rings, clips and Top-End Gasket Kit and a . Everything you need to service your MX Top-End.
Cylinder Casting Numbers 5UP-11311-21-00, 5MW-11311-02-00, 5CU-11311-00-00
You may optionally choose a Pro-X (CAST) piston below.
01.2321.A

Pricing: $539.95

Customize Your Item

Choose either a Premium Forged Wossner Piston or a Cast Piston from Pro-X

Select Your Piston

- Select Your Piston -

* required

Choose your cylinder casting number 5UP, 5MW or 5CU based on what is actually on your bike!

Choose your casting #

- Choose your casting # -

* required

If you want a factory OEM Yamaha cylinder 5UP, 5MW or 5CU they require a core cylinder to be returned first to MCB so we can re-plate for the next customer. Options listed below.....Your cylinder core that you are returning cannot be ported, steel lined (sleeved), decked and have internal water jacket cracks that we cannot get to in order to weld. It is understood that your cylinder walls are damaged, scored, gouged, etc.

Yamaha YZ250 core option

- Yamaha YZ250 core option -

* required

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Description

MCB uses Wössner pistons exclusively in all our MX/Off road kits. Germany's finest aftermarket forged piston manufacturer with over 25 years of experience in the Powersports / racing industry.

Wössner is currently the piston of choice for Monster Energy Star Yamaha Racing Team

Pro X pistons are the premier cast piston made from a specialized low-expansion, low-friction aluminum alloy, commonly used by OEM engine manufacturers to give the piston an incredibly low co-efficient of friction.

Prox Racing Parts is official technical sponsor of the Monster Energy Pro Circuit Kawasaki team